?? numeric.h
字號(hào):
/* ---------- * numeric.h * * Definitions for the exact numeric data type of Postgres * * 1998 Jan Wieck * * $Header: /usr/local/cvsroot/pgsql/src/include/utils/numeric.h,v 1.6.2.1 1999/08/02 05:25:26 scrappy Exp $ * * ---------- */#ifndef _PG_NUMERIC_H_#define _PG_NUMERIC_H_/* ---------- * The hardcoded limits and defaults of the numeric data type * ---------- */#define NUMERIC_MAX_PRECISION 1000#define NUMERIC_DEFAULT_PRECISION 30#define NUMERIC_DEFAULT_SCALE 6#define NUMERIC_MAX_DISPLAY_SCALE NUMERIC_MAX_PRECISION#define NUMERIC_MIN_DISPLAY_SCALE NUMERIC_DEFAULT_SCALE + 4#define NUMERIC_MAX_RESULT_SCALE (NUMERIC_MAX_PRECISION * 2)#define NUMERIC_MIN_RESULT_SCALE (NUMERIC_DEFAULT_PRECISION + 4)#define NUMERIC_UNPACKED_DATASIZE (NUMERIC_MAX_PRECISION * 2 + 4)/* ---------- * Sign values and macros to deal with n_sign_dscale * ---------- */#define NUMERIC_SIGN_MASK 0xC000#define NUMERIC_POS 0x0000#define NUMERIC_NEG 0x4000#define NUMERIC_NAN 0xC000#define NUMERIC_SIGN(n) ((n)->n_sign_dscale & NUMERIC_SIGN_MASK)#define NUMERIC_DSCALE(n) ((n)->n_sign_dscale & ~NUMERIC_SIGN_MASK)#define NUMERIC_IS_NAN(n) (NUMERIC_SIGN(n) != NUMERIC_POS && \ NUMERIC_SIGN(n) != NUMERIC_NEG)/* ---------- * The Numeric data type stored in the database * ---------- */typedef struct NumericData{ int32 varlen; /* Variable size */ int16 n_weight; /* Weight of 1st digit */ uint16 n_rscale; /* Result scale */ uint16 n_sign_dscale; /* Sign + display scale */ unsigned char n_data[1]; /* Digit data */} NumericData;typedef NumericData *Numeric;#define NUMERIC_HDRSZ (sizeof(int32) + sizeof(uint16) * 3)#endif /* _PG_NUMERIC_H_ */
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